Stiller B, Foaleng S M, Beugnot J-C, Lee M W, Delqué M, Bouwmans G, Kudlinski A, Thévenaz L, Maillotte H, Sylvestre T
Institut FEMTO-ST, Université de Franche-Comté, Besançon, France.
Opt Express. 2010 Sep 13;18(19):20136-42. doi: 10.1364/OE.18.020136.
In this paper we investigate the effect of microstructure irregularities and applied strain on backward Brillouin scattering by comparing two photonic crystal fibers drawn with different parameters in order to minimize diameter and microstructure fluctuations. We fully characterize their Brillouin properties including the gain spectrum and the critical power. Using Brillouin echoes distributed sensing with a high spatial resolution of 30 cm we are able to map the Brillouin frequency shift along the fiber and get an accurate estimation of the microstructure longitudinal fluctuations. Our results reveal a clear-cut difference of longitudinal homogeneity between the two fibers.
在本文中，我们通过比较两根以不同参数拉制的光子晶体光纤，研究微观结构不规则性和外加应变对后向布里渊散射的影响，以尽量减少直径和微观结构波动。我们全面表征了它们的布里渊特性，包括增益谱和临界功率。使用具有30厘米高空间分辨率的布里渊回波分布式传感，我们能够绘制出沿光纤的布里渊频移，并准确估计微观结构的纵向波动。我们的结果揭示了两根光纤在纵向均匀性上的明显差异。
